摘要
在核电厂中,流动加速腐蚀主要发生在二回路,对生产实践造成很大影响。本次研究运用CFD在250℃和273℃下对带有孔板的直管以及射流冲击结构进行模拟研究,得出流场及剪切力在管道内和试样表面的分布,找出带孔板管道由于管壁减薄引起的薄弱环节及角度对射流冲击的影响。结果表明,直管孔板中管径比的变化对冲刷后剪切力最大点影响很小。冲刷角度越小,剪切力越大,机械作用越强。
In nuclear power plants,the flow accelerated corrosion（FAC） occurs mainly in the secondary circuit,causing a significant impact on production practice.Straight pipes with an orifice and jet impingement were simulated by CFD at 250 ℃ and 273 ℃,achieving flow patterns and shear force distributions on the surfaces of plates and in the internal of pipes,and identifying weak points caused by pipe thinning with an orifice and influence of jet impingement angle.The results show that the orifice diameter ratio in the straight pipe changing has little effect on the maximum point of shear stress.With smaller crashing angle,the greater the shear force is,and the stronger the mechanical action is.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2012年第10期1197-1201,共5页
Atomic Energy Science and Technology
关键词
流动加速腐蚀
孔板
射流冲击
CFD
flow accelerated corrosion
orifice pipe
jet impingement
CFD
